VARIATION IN MELAMPSORA-OCCIDENTALIS RUST ON POPLARS IN THE PACIFIC-NORTHWEST

被引：10

作者：

HSIANG, T

CHASTAGNER, GA

机构：

[1] Environmental Biology, University of Guelph, Guelph, ON

来源：

CANADIAN JOURNAL OF PLANT PATHOLOGY-REVUE CANADIENNE DE PHYTOPATHOLOGIE | 1993年 / 15卷 / 03期

关键词：

D O I：

10.1080/07060669309500819

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

We examined the variation in virulence of Melampsora occidentalis on poplar clones. Thirty isolates of M. occidentalis from coastal or interior areas of the Pacific Northwest were tested in vitro on leaf disks from five poplar clones (four Populus trichocarpa, and one P. trichocarpa x P. deltoides). Significant differences were found among clones and among isolates with respect to uredial number, disease severity, and disease incidence. Most importantly, isolates from the interior east side of the Cascade Mountains showed a significant clone x isolate interaction for uredial number, indicating physiological specialization of the pathogen on different poplar host genotypes. For the 20 coastal west-side isolates, the clone x isolate interaction was not significant. For the 10 interior M. occidentalis isolates, which showed greater overall virulence on the five poplar clones tested than did coastal isolates, the occurrence of a significant clone x isolate interaction could indicate that the pathogen has adapted to the less rust-favourable environment of the interior through greater physiological specialization. Although these data indicate the potential for physiological specialization in M. occidentalis populations, the selection pressure required to cause a change in the virulence structure of this essentially wild and discontinuous pathosystem in the coastal Pacific Northwest would have to be intense, and possibly would result only from widespread domestication of the host species.

引用

页码：175 / 181

页数：7

共 31 条

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